Anyone with young kids will likely know how many broken crayons you'll accumulate! Rather than throw them out I've collected them over time and last week I finally got around to recycling them into new crayons.
First, I took all the papers off, I had mostly been doing this as I collected them but there were a few I missed. I then broke them into smaller pieces and put them into a mini muffin tin, using cases to make it easier to pop them out. I sorted them by colour but you could mix them.
I then popped them in the oven at 130 C for around 5 - 7 min. It may take a bit more time if you have bigger pieces. Just keep a watch on them until they've completely melted. Once they were done I took them out and let them cool and set. This didn't take long as they were small, maybe 20 min.
Once cooled I popped them out of the tin and peeled off the cases and we have new crayons.
As the crayons are non-toxic there's no need to have a tray specifically for crayon melting use (although that's fine too!), a good scrub in hot, soapy water or in the dishwasher and it's good for food use again.